Evo X / RA - SST Internal Oil Filter

A replacement internal oil filter for the Evo X and Ralliart DCT470 SST transmission — the first component to fail when service intervals are stretched. Inside the gearbox, this filter steadily clogs with friction material and dust; as it blocks, system oil pressure drops and the SST becomes slow and inefficient. The classic warning sign is the "SST whine" on cold start-up, as the oil pump and mechatronic unit are momentarily starved of oil, usually easing as the fluid warms and thins. Unlike the external filter, the internal filter isn't accessible from outside — replacing it requires removing the mechatronic unit, so it's a job best done with the gearbox out of the car (or by an experienced workshop). If you suspect yours is blocked, contact us: we can data-log your car and monitor internal gearbox pressures to confirm before you commit to the work.

Does my internal filter need replacing?

The most common tell-tale sign of a blocked internal filter is the "SST whine", which is most prominent on cold-start. This noise is your oil pump and mechatronic unit being starved for oil, usually reducing as oil viscosity improves as the car warms up. Please contact us if you believe your internal filter is clogged, we have the facilities to data-log your car and monitor internal gearbox pressures to confirm the diagnostic.